CTRL+H displays the Replace dialog, just as it has in all earlier versions.
CTRL+F was formerly alloocated to EditFind, but re-allocated in Word 2010 to the Navigation task pane, now I believe called Advanced Find(?), but if you prefer the Find dialog, you can always re-assign CTRL+F to the EditFind command which is still available.

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Graham Mayor - MS MVP (Word) (2002-2019)
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